Adjustable lamp holder



Filed April 2,6. 1927 2 Sheets-Sheet Z.' f INVENTOR. 5 gnam/w Je,Uwe/wa,

ATTORNEY Nov. 12, 1929. F. H. OWENS l1,735,334

ADJUSTABLE LAMP HOLDER Filed April 26, 1927 Z'Sheets-Sheet 2 fg ZT222.-- E INVENTOR. ga@ 'MW 5. UAW/ws.

7% .'TTORNEY' Patented Nov. 12, 1929 FREEMAN H. OWENS,

OF NEW YORK, N. Y.

ADJUSTABLE LAMP HOLDER Application filed April 26,

My invention relates broadly to sound reproduction and more particularlyto an adjustable holder for the light source in a sound recordreproducing system.

One of the objects of my invention is to provide a construction of anadjustable holder for a lamp in a sound reproducing system forfacilitating the focusing of the light on the light aperture for theprojection of a film record upon a photoelectric cell:

Another object of my invention is to provide a construction of lampholder having a plurality of independent adjustments for permitting alight source to be shifted in a plurality of directions for focusing thelight accurately upon the slit adjacent a sound film record.

Still another object of my invention is to provide a simplifiedconstruction of lamp holder for sound reproduction comprising a minimumnumber of parts so arranged as to be readily manufactured and assembledfor mounting upon a motion picture projecting machine arranged for thesimultaneous reproduction of sound with the projection of pictures.

My invention will be more clearly understood from the specificationhereinafter following by reference to the accompanying drawings inwhich:

Figure 1 diagrammatically illustrates the arrangement of the adjustablelamp holder and sound reproducing system in which the holder isemployed; Fig. 2 is a front view of the adjustable lamp holder with alamp mounted therein; Fig. 3 is a side elevation of the lamp holderillustrated in Fig. 2; Fig. 4 is a bottom plan view of the lamp holderillustrated in Figs. 2 and 3; Fig. 5 is a cross-sectional view takenthrough thelamp holder illustrated in Fig. 2; Fig. 6 is across-sectional View taken through the lamp holder on line 6-6 of Fig.3; Fig. 7 is a lateral cross-sectional view taken on line 7 -7 of Fig. 3Fig. 8

is a cross-sectional View taken on line 8-8 of Fig. 3, and Fig. 9 is across-sectional View taken on line 9 9 of Fig. 3.

In the reproduction of sound from iilm records it is essential that anintense light be centered upon the slit over which the sound film 1927.Serial No. 186,709.

record passes. My construction of adjustable lamp holder has beendeveloped with a view of accurately directing the light rays from alight source upon the slit in a sound reproduction system. The lampholder is capable of moving the light source laterally orlongitudinally, or the light source may be revolved about a lateralplane or other movements imparted to the light source for accuratelycentering the light on the slit. The lamp is substantially insulatedfrom the motion picture projecting machine and the parts of the holdercompactly arranged for mounting within a casing adjacent the motionpicture projecting machine.

Referring to the drawings in more detail, reference character 1designates the light source in the form of a lamp having a base 2 whichis insertable into the collar 3 forming the socket. A bayonet retainingjoint 4 is provided for locking the lamp in position in the holder. Aninsulated bushing member 5 projects through the socket member 3 andprovides a support for a rod member 17 spring pressed at 18 for urgingthe contact member 6 in abutment with the lower contact of the base 2.The socket member 3 is mounted upon an insulated supporting member 7 andreta-ined in position thereon by means of a strap 9 fastened by screwdevices 3() and 31 to the supporting member 7.

The side of the lamp housing which is supported from the motion pictureprojecting apparatus is designated at 10, and secured thereto by meansof screws 28 I provide an insulated member 12. Pin members 13 and 14project at right angles from the insulated member 12 and over these pinmembers the sleeve members 16 and 15 are arranged to slide for adjustingthe lamp to selected positions, as will be more fully explainedhereinafter. The supporting member 7 is arranged to frictionally engagethe tubular members 15 and 16 and to be secured rigidly thereto by meansof the block member 19 which is notched at 20 and 21 to fit against thesides of the tubular members 15 and 16. A plate member 22 serves as asupport for the block 19 and as a means for centering the adjustablescrew devices 23 in the supporting member 7. A spring 24 is provided forconstantly urging the plate member 22 against the block member 19 andenabling the entire structure to be moved along the pins 13 and 14 to aselected position. The block member 19 is slotted at 25 and through thisslot the screw device 23 passes. I also provide pin members 26 and 27extending through the slot 25 for rigidly positioning the lamp in avertical position capable of lateral adjustment in the slot 25. Byreleasing the pressure of spring 24 by retracting the screw device 23the lamp 1 may be shiftedin position within limits governed by theabutment of pins 26 and 27 with the end walls of the slot 25. It will beobserved that the lamp structure is entirely insulated from the support10 and that the power for energizing the lamp 1 is brought in throughthe pins 13 and 14' electrically insulated from the supporting means 10.Flexible connectors 32 and 33 are provided extending between the tubularmembers 16 and 15 and the lower contact 6 and the socket 3,respectively. The flexible connector 32 extends from the screw device 3on strap member 9 to the sleeve 16 which connects with pin 13 throughwhich power is supplied by connecting lug 32a. The exible connector 33extends between the sleeve and the lower contact 6, which engages thebase of the lamp. Lug 33=1L is secured to pin 14 for conveying power tothe lamp system.

The entire lamp unit is removable :trom the pins 13 and 14 enabling arenewable unit to be quickly inserted upon the supporting pins withoutrefocusing the lamp. In the diagrammatic illustration of Fig. 1 I haveshown the. lamp 1 arranged for directing light rays throughthe lenssystem 34, slit 35, sound film 36 upon the photoelectric cell 37. Theadjustments of which the lamp is capable in the process of focusing thelight upon the slit has been designated by the ar- Y rows in Fig. 1. Itwill be observed that by loosening the strap member 9 the verticalposition of the lamp 1 may be selected. 'Ihe lamp may be rotated in itsposition. The entire lamp carrier is' shiftable laterally by means ofscrew adjustment 23 and the movement of pins 26 and 27 in the slot 25,and in addition the lamp structure may be shifted longitudinally withrespect to pins 13 and 14 for focusing the light. After the proper focusis selected the lamp may be renewed from time to time without a furtherresetting of the holder.

The lamp structure of my invention has been found to be extremelypractical in man ufacture and production and successful in itsoperation.

While I have described my invention in one of its preefrred embodiments,I desire that it be understood that modifications may be made but thatno limitations upon my invention are intended other than are imposed bythe scope of the appended claims.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is as follows:

1. An adjustable' lamp holder comprising an insulated bracket member, apair of pin members laterally projecting from said insulated bracketmember, a lamp supporting structure comprising an insulated member, aspring pressed clamp for selectively positioning said insulated memberwith respect to Said laterally projecting pin members, said clamp havinga portion thereof laterally shiftable in position with respect to saidpin members, said clamp as a whole being longitudinally shiftable withrespect to said pin members, and a rotatably mounted lamp socket carriedby said lamp supporting structure and shiftable to selected verticalpositions for facilitating the focusing of said lamp.

An adjustable lamp holder comprising an insulated bracket member, a pairof pins laterally projecting from said insulated bracket member, tubularmembers enclosing said pins, an insulated clamp having a pair ofportions, one of said portions being disposed on one side of saidtubular members and the other of said portions being disposed on theopposite side of said tubular members, spring means for pressing saidportions into engagement with said tubular members, a rotatable andvertically adjustable mount carried by one of said portions, said mountbeing arranged to receive a lamp, said lamp being shiftable laterally inposition and movable to a selected rotated and vertical position withrespect to said pins and with respect to said other portion of saidclamp.

3. An adjustable lamp holder comprising an insulated bracket, a pair ofin members laterally projecting :trom sald Ainsulated bracket,independent tubular members longitudinally slidable over said pinmembers, a clamp consisting of a pair of separable portions engagingopposite sides of said tubular members, one of said portions beinglongitudinally slotted intermediate said pins, and the other of saidportions being provided with studs extending through said firstmentioned.

portion for limiting the lateral displacement of said first mentionedseparable portion with respect to the other of said se arable portionswhile permitting longitu inal ad'us'tment with respect to said tubularmem ers, .and means for su porting a lamp in said first mentioned separale portion.

4. rAn adjustable lamp holder comprising an insulated bracket,pinmembers extending from said bracket, a lamp supporting structure,tubular members slidable over said pin members, said lamp supportingstructure including 'a pair of insulated separable portions arranged togrip opposite sides of said tubular members, one of said separableportions aooog apertm'ed to receive muoio projec'tng from the other ofsaid sopamolo por-

